Id be steering clear of those commercially available reco motors if I were you, quality wise they make the Gen3 look like BMWs....
Go a decent second hand one from the wreckers, or better yet a professionally rebuilt one
1993 ED XR6 M5 (1 of 329)
Turbo on the way!!
1993 EBII Fairmont (Now wrecking, PM if you want any parts)
1988 Nissan R31 Skyline